#include <iostream>

int main()
{
    int a = 0;
    std::cout << "hello world!" << std::endl;
    std::cout << "bug-fix" << std::endl;
    std::cout << "bug" << std::endl;
    // int b = 0;
    int b = 0;
    printf("%i\n", b);
    printf("hello world\n");
    return 0;
}